Non-Return Valve 70 / 70U. MWP: 16/10Bar. 3/4″, 1″, 1¼” & 1½”BSP

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Max. working pressure: 16 bar

Air max: 1900m3/h

Opening pressure: 4mbar

Suitable for the following gases:

Town gas, Natural gas, LPG



Compressed air

Non-flammable gases

Body: Brass

Sealing material: NBR/CR

Thread sizes: 1/2″, 3/4″, 1″ BSP

Item #: 828
Quantity Available: 100

100 in stock


WITT non-return valves (check valves) for reliable protection against dangerous reverse gas flow. Every non-return valve (check valve) 100% tested.


  • a spring-loaded non-return valve (check valve) prevents back feeding of gases which could lead to unwanted gas mixtures
  • low pressure drops – using complex valve assembly with low opening pressures (approx. 4 mbar)
  • brass filter protects the non-return valve (check valve) against flashbacks, extending the service life
  • diverse applications – useful for many technical gases
  • reduce installation costs – the spring-loaded valve is not affected by gravity and may be installed in any orientation

Operation / Usage:

  • non-return valves (check valves) are used to protect equipment and pipelines against dangerous reverse gas flow. Use is possible for applications in accordance with EN 746-2
  • non-return valves (check valves) are proved in accordance with DIN EN ISO 5175-2. They may also be used as a safety device to protect against flashbacks (proved in accordance with DIN EN ISO 5175-1 point 6.7), which may result from the combustion of natural gas/ LPG with air
  • the maximum ambient / working temperature is 70 °C / 158 °F


  • annual testing of the non-return valve (check valve), body leak tightness and flow capacity is recommended
  • WITT is happy to supply special test equipment
  • non-return valves (check valves) are only to be serviced by the manufacturer

Company certified to ISO 9001 and PED 97/23/EG Module H
CE-marked in accordance with PED 97/23/EC
Cleaned for Oxygen Service according to EIGA IGC Doc 13/12/E: Oxygen Pipeline and Piping Systems


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